NOAA S-57 chart cell
Approaches to Saint Helena Sound - North Atlantic Ocean
US4SC1AN
- Usage band
- Approach · code 4
- Current edition
- 1.1
- Features
- 217
- S-57 layers
- 23
- Published
- Nov 26, 2025
- Manifest updated
- Jun 22, 2026, 2:51 PM UTC
Coverage
- North
- 32.40000° N
- South
- 32.10000° N
- West
- 80.40000° W
- East
- 80.10000° W
- Center
- 32.25000° N, 80.25000° W
- Bounds area
- 274 sq nm
- Feature density
- 0.7909 / sq nm
Chart Statistics
20 largest layers shown
- Average features per layer
- 9.4
- Smallest layer
- 1
- Largest layer
- 66
- Area sq km
- 941
- Features per sq km
- 0.23058
- SBDARE Seabed area 66
- DEPARE Depth area 57
- DEPCNT Depth contour 55
- SOUNDG Sounding 6
- BOYLAT Lateral buoy 4
- BOYSPP Special purpose buoy 3
- MAGVAR Magnetic variation 3
- OBSTRN Obstruction 3
- WRECKS Wreck 3
- M_NPUB 2
- RESARE 2
- WATTUR 2
- ADMARE 1
- CONZNE 1
- COSARE 1
- CTNARE Caution area 1
- EXEZNE 1
- LIGHTS Light 1
- M_COVR Coverage 1
- M_NSYS 1
Nearby Chart Cells
Approach usage band
Current Edition Files
The NOAA ZIP archive is the upstream source for this chart cell; the other files are Open Ships generated derivatives for web and GIS use.
- Original NOAA ZIP archive https://www.charts.noaa.gov/ENCs/US4SC1AN.zip
- S-57 base cell https://charts.openships.ai/noaa/s57/approach/US4SC1AN/1.1/US4SC1AN.000
- S-57 update 001 https://charts.openships.ai/noaa/s57/approach/US4SC1AN/1.1/US4SC1AN.001
- GeoJSON https://charts.openships.ai/noaa/s57/approach/US4SC1AN/1.1/US4SC1AN.geojson
- GeoParquet https://charts.openships.ai/noaa/s57/approach/US4SC1AN/1.1/US4SC1AN.parquet
- Metadata JSON https://charts.openships.ai/noaa/s57/approach/US4SC1AN/1.1/metadata.json
Editions
| Edition | Published | Metadata |
|---|---|---|
| 1.1 | Nov 26, 2025 | metadata.json |